Flash Undersink Reverse Osmosis Water Filter

• I hear water going into the drain even if no one used the filtered water in a while

  It's possible that the water pressure variation from the well pump or municipality caused the system to go into production mode. Or if you have an ice maker in the fridge, it might have been making some ice and using the water. Otherwise, it might indicate a possible leak of filtered water. Plea...

• There are a lot of air bubbles within the filtered water. Is it normal?

  It is normal to have bubbles when the filters are new. The carbon is very porous and releases air/bubbles. Depending on usage, the bubbles within the filtered water will go away over time.